2019高考二輪復(fù)習(xí)英語(yǔ)教案: 情態(tài)動(dòng)詞和虛擬語(yǔ)氣
were they here now, they could help us. =if they were here now, they could help us.他們現(xiàn)在在的話，就會(huì)幫助我們了。
had you come earlier, you would have met him. =if you had come earlier, you would have met him.
你來(lái)得早一點(diǎn)，就碰到他了。
should it rain, the crops would be saved. =were it to rain, the crops would be saved.假如下雨，莊稼就有救了。
【典型例題】
_____ to do the work, i should do it some other day.
a. if were i b. i were c. were i d. was i
答案c. 在虛擬條件狀語(yǔ)中如果有were, should, had這三個(gè)詞，通常將if省略，主語(yǔ)提前, 變成 were, should, had +主語(yǔ)的形式。但要注意，在虛擬條件狀語(yǔ)從句中，省略連詞的倒裝形式的句首不能用動(dòng)詞的縮略形式。如我們可說were i not to do, 而不能說 weren't i to do.
e.g. had you been here just now, you would have met her. 你要是剛才在這兒，就見到她了。
were i not busy, i would have come. 假如我不忙，我就會(huì)來(lái)了。
十二、其他句型
1. 虛擬語(yǔ)氣用在it is ＋形容詞＋that的主語(yǔ)從句中
在某些表示愿望、建議、請(qǐng)求、命令等形容詞后的主語(yǔ)從句中，需用虛擬語(yǔ)氣。其表達(dá)形式為should ＋動(dòng)詞原形或省略should直接用動(dòng)詞原形。這類形容詞有 advisable（合理的），appropriate（適當(dāng)?shù)模琧ompulsory（必須的），crucial（緊急的），desirable（理想的），essential（必要的），imperative（迫切的），important（重要的），incredible（驚人的），natural（自然的），necessary（必要的），possible（可能的），preferable（更好的）， probable（可能的），strange（奇怪的），urgent（緊迫的）， vital（極為重要的）。
it is essential that these application forms be sent back as early as possible.這些申請(qǐng)表應(yīng)盡早地寄回，這是很重要的。
it is vital that enough money be collected to fund the project.重要的是募集足夠的錢，為這個(gè)項(xiàng)目提供資金。
2. 虛擬語(yǔ)氣用在it is ＋過去分詞＋that的主語(yǔ)從句中
在it is ＋過去分詞＋that的主語(yǔ)從句中，常用虛擬語(yǔ)氣，表示愿望、建議、請(qǐng)求等主觀意向，謂語(yǔ)用 should ＋動(dòng)詞原形或省略should只用動(dòng)詞原形。這類過去分詞有：decided，demanded，desired，insisted，ordered，proposed，suggested，recommended，requested， required等。
it is desired that we（should）get everything ready this evening.希望我們今晚一切都準(zhǔn)備就緒。
3. 虛擬語(yǔ)氣用在it is（about /high）time ＋that定語(yǔ)從句中
在it is（about/high）time ＋that定語(yǔ)從句中需用虛擬語(yǔ)氣，表示“該做……的時(shí)候了”，其動(dòng)詞形式用一般過去時(shí)或should ＋動(dòng)詞原形
it's already 5 o'clock now,don't you think it's about time we went home？已經(jīng)5點(diǎn)鐘了，你不認(rèn)為我們應(yīng)該回家了嗎？
【點(diǎn)撥】①在this is the first time /second time that...句型中，從句中謂語(yǔ)動(dòng)詞用陳述語(yǔ)氣完成時(shí)態(tài)
is this the first time that you have visited hongkong？這是你第一次參觀香港嗎？